Lock



May 3o, 1933. J v PACHER 1,911,324

Loox I Filed Dec. 16, 1950 nventor Bg 19743@ @L Ciftornegs Patented May 30, 1933 UNITED STATES PATENT OFFICE JOSEF V. PACHR, OF BROOKLYN, NEW YORK, AE1-SIGNOR EO 'IFI-1EV INTERNATIONAL POSTAL SUPPLY COMPANY, F BROOKLYN, NEW YORK, A CORPORATION 0F NEW YORK LOCK

Application filed December 16, 1930. Serial No. 502,784.

the tumblers or pins individually. Havingl ascertained the lift necessary to elevate each pin, it is a simple matter to determine the proper combination for opening the lock.

.When an attempt is made to open anlock without using a key, i. e.,. by picking the lock, it is necessary to bring the shear surfaces of the locking members in exact alignment with the barrel or cylinder of the lock. In locks of the type to` which the present invention belongs this operation is called feeling, due to the fact that it is necessary to feel or find the line set by the periphery of the shaft which is locked. When picking or feeling this kind of lock2 it is first necessary that the shaft betensioiied7 that is, turned to set up a shearing effect or cstablish a shearing line. Then, by means of a wire or other object, the exact shear line for each of the tumblers is felt for.

It is an object of the! present invention to L, prevent opening of the lock by touch or 3" feel by interposing between portions of the tumblers transverse intermediate pins cooperating with adjacent pins in pairs in such a Way that longitudinal movement of one pin of the pair is transmitted in pai't to the other of the"pair of pins. The manner in which the intermediate pins distribute longitudinal movement in both pins of a pair will be understood from the following description of the invention taken in connection with the accompanying drawing, in which Fig. 1 is a longitudinal section of a barrel lock embodying the interposed intermediate pins;

Fig. 2 is a sectionalV View taken on line 2 2 of Fig. 1;

Fig. 3 is a section of a modification of the invention' as applied to a shaft lock; and

Fig. 4 is a sectional. view taken on line 4`4 of Fig. 3. f

Referring to Figs. 1 and 27 the housing 11 is provided'with a plurality of parallel re.- cesses 12 to accommodate pins 13. Each of the pins consists of threeL sections 13a, 13?) and 130. The housing is also provided with a-longitudinal slot 14 in which are disposed intermediate pins 15 in vtransverse relation to the tumbler pins. It will be seen vthat the intermediate pins are interposed between sectionsY 13d and 13b and are of suicient length to cooperatewith two adjacent pins. Each of the sections 13a. and 13b is chamfered at that end which contacts with ntermediate' pins' better to permit pivotal movement of the intermediate pins aboutl the fulcra points provided by the ends of the tumbler pins. y

Mounted for rotative movement within the housing ll'is a cylindrical vbarrel 16 having a key slot 17 therein, Radial recesses 18 in the barrel are disposed to align with recesses 12in the housing and terminate short of the axis of the barrel to provide shoulders 19'upon which the pins may rest n when the key 21 is withdrawn from the lock. Springs 22 in the ends of recesses 12 tend normally .to force the pins towards shoulders 19 and move the lines of separation between sections `137) and 130 out of alignment with respect to the circumference of the barrel, thus preventing rotation yof the barrel except when key 21 is inserted. Upon insertion of the key, the pins are so elevated that the lines` of separation are brought into coincidence with. the circuinferential surface of the lock barrel that the latter may be turned.

In the modification illustrated in Figs. 3 and 4 the relation of the divided pins and intermediate pins is similar to that shown in Figs, 1 and 2. The key slot 17 ,y however, is in thel lock housing while the barrel is replaced by the shaft 23 of any machine which may be locked. It will be noted that fisio the intermediate pins are disposed between the sections 13h and 130 and that the line of separation between sections 13a and 13b must'be brought into coincidence with the circumferential surface of shaft 23 before the shaft may be turned. In other respects, the operation of the lock shown in Figs. 3 and 4 corresponds with that by which the lock illustrated in Figs. l and 2 may be opened.

Y both forms of the invention illustrated is the same. Assuming that the lock is being eX- perimented with for the purpose of feeling for the combination, as each pin is lifted the intermediate pin cooperating therewith is rocked about the lowest section of the other of the pair of pins contacting the intermediate pin. Since the intermediate pin has substantial thickness, it is apparent that longitudinal movement of one of the pair of pins will eect some longitudinal movement of the other of the pair. Usually the pins 12, 13, 13a, 13b and 130 are relatively small (1j/16 in diameter) and the tolerances allowed for the lit of the shaftin the loclr exceedingly small (l/lOOOO of an inch) so that the slightest misalignment of the pins makes it impossible to turn the shaft. This operation of feeling is, therefore, a very delicate one and any object tending to set up interference or false pressure on the lift of the pins will destroy this feel Such is the function of pins l5 in the present invention in both forms of which it has been ascertained that this'distribution of the lift has the effect of destroying the feel and prevents determination of the lock combination. Thus,'if any one of the floating pins l5 is moved in the slightest degree, it assumes a-diagonal position in relation to the two tumblers with which it cooperates, not only imposing a false'pressure on the tumbler being, felt, but on its twin as well. Likewise, if the twin is moved, the additional resistance brought into play by the tilting pin l5, talienwith spring pressure, seriously interferes with, if it does not absolutely destroy, the feel necessary-.to find the shear line.

Vhile preferred embodiments of the invention have been described and illustrated,

it is not intended that the invention be limited only to the forms shown. The invention is obviously susceptible of other modifications within the terms of the appended claims.

What is claimed is l. A pin tumbler lock comprising va housing havinga parallel recesses therein; a rotatable member having parallel recesses adapted to align with the recesses in said housing; sectional tumbler pins in said recesses; .and `an intermediate imperforate transverse pin interposed between Vsections lof said tumbler pins and cooperating with two adjacent tumbler pins.

2. A pin tumbler lock comprising a housing having parallel recesses therein and a slot disposed transversely of said recesses; a rotatable memberrhaving yparallel recesses adapted to align with the recesses in said housing;` sectional tumbler pins in said resaid tumbler pins and each of'said interf? mediate pins cooperating with a pair of adjacent tumbler pins.

4l. A pin tumbler look comprising a housing having parallel recesses therein; a rotatable member having parallel recesses adapted to align with the recesses in said housing; sectional tumbler pins in said recesses; and an intermediate imperforate transverse pin interposed between sections of 'said tumbler pins and cooperating with two adjacent pins in rabutting relation thereto, said sections be ing chamfered at the ends which abut said transverse pin.

5. A pin tumbler lock comprising a housing having parallel recesses therein; sectional tumbler pins in saidrecesses; and an intermediate imperforate transverse pin interposed between sections Vof said tumbler pins and cooperating with adjacent parallel tumbler pins.

ln testimony whereof I have signed my nameto this specification.

JOSEF V. 'PAGHER 

